CODEWITHSUNDEEP
powershell
gruber
gruber

Reputation: 29719

rename files in powershell

How can I rename each file in folder:

pattern is: (first part of file name).digit_(endoffilename)

for example

a.1_f
b.2_f
c.3_g

I would like to replace it with

a.01_f
b.02_f
c.03_ g

...

Thanks for help

Upvotes: 2

Views: 2396

Answers (2)

Keith Hill
Keith Hill

Reputation: 201592

Try this:

Get-ChildItem | Where {!$_.PSIsContainer} | 
    Rename-Item -NewName {$_ -replace '([^.]+)\.(\d)(\w)', '$1.0$2$3'} -wh

Or if you have more than nine files:

gci | ? {!$_.PSIsContainer -and $_.Name -match '([^.]+\.)(\d)(\w+)'} |  
  rni -NewName {$matches[1] + ("{0:00}" -f [int]$matches[2]) + $matches[3]} -wh

The second example uses aliases to shorten the command (easier for typing). gci is the alias for Get-ChildItem, ? is the alias for Where-Object and rni is the alias for Rename-Item. The -wh invokes the WhatIf functionality where PowerShell will show you what it would do so you can twiddle with the command until you're happy with what the results would be. Then remove the -wh to actually execute it.

Upvotes: 5

Scott Weinstein
Scott Weinstein

Reputation: 19117

One way to do this is to break the file apart via regular expressions, then assemble the new file name from the parts, followed by a Rename-Item

  • A regex matching your files might be \w+\.\d+_\w
  • To print "001" when you have 1, you could use the format operator, such as "{0:000}" -f 1
  • To loop through the files, use Get-ChildItem & Foreach-Object, or as I like to write ls | % {}

Upvotes: 0

Related Questions